메타데이터
| 항목 |
값 |
| Designation |
C/2017 D3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-26T17:48:37.664640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:30Z |
| Obs used |
523 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-10-06.0000000 |
| e |
1.00243639 |
| q (au) |
4.971286 |
| a (au) |
-2040.429612 |
| i (deg) |
125.570039 |
| Ω (om, deg) |
186.618173 |
| ω (w, deg) |
340.767499 |
| M (ma, deg) |
0.001735 |
밝기
산란 + 전체 선형
$$
M_a = (10.067 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.067 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.997 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
03:58:17.30 |
+72:31:24.6 |
HIP 18545 |
12.11 |
| 2026-06-01 12:00 |
03:58:32.63 |
+72:31:37.4 |
HIP 18545 |
12.06 |
| 2026-06-02 00:00 |
03:58:47.93 |
+72:31:50.8 |
HIP 18545 |
12.11 |
| 2026-06-02 12:00 |
03:59:03.21 |
+72:32:04.5 |
HIP 18545 |
12.26 |
| 2026-06-03 00:00 |
03:59:18.47 |
+72:32:18.7 |
HIP 18545 |
12.51 |
| 2026-06-03 12:00 |
03:59:33.70 |
+72:32:33.4 |
HIP 18545 |
12.86 |
| 2026-06-04 00:00 |
03:59:48.91 |
+72:32:48.5 |
HIP 18545 |
13.29 |
| 2026-06-04 12:00 |
04:00:04.10 |
+72:33:04.0 |
HIP 18545 |
13.80 |
| 2026-06-05 00:00 |
04:00:19.25 |
+72:33:20.0 |
HIP 18545 |
14.37 |
| 2026-06-05 12:00 |
04:00:34.39 |
+72:33:36.4 |
HIP 18545 |
15.01 |
| 2026-06-06 00:00 |
04:00:49.49 |
+72:33:53.3 |
HIP 18545 |
15.70 |
| 2026-06-06 12:00 |
04:01:04.57 |
+72:34:10.6 |
HIP 18545 |
16.44 |
| 2026-06-07 00:00 |
04:01:19.62 |
+72:34:28.4 |
HIP 18545 |
17.22 |
| 2026-06-07 12:00 |
04:01:34.64 |
+72:34:46.6 |
HIP 18916 |
16.70 |
| 2026-06-08 00:00 |
04:01:49.62 |
+72:35:05.2 |
HIP 18916 |
15.95 |
| 2026-06-08 12:00 |
04:02:04.58 |
+72:35:24.2 |
HIP 18916 |
15.25 |
| 2026-06-09 00:00 |
04:02:19.51 |
+72:35:43.7 |
HIP 18916 |
14.59 |
| 2026-06-09 12:00 |
04:02:34.40 |
+72:36:03.7 |
HIP 18916 |
14.00 |
| 2026-06-10 00:00 |
04:02:49.25 |
+72:36:24.0 |
HIP 18916 |
13.47 |
| 2026-06-10 12:00 |
04:03:04.08 |
+72:36:44.8 |
HIP 18916 |
13.02 |
| 2026-06-11 00:00 |
04:03:18.87 |
+72:37:06.0 |
HIP 18916 |
12.65 |
| 2026-06-11 12:00 |
04:03:33.62 |
+72:37:27.7 |
HIP 18916 |
12.36 |
| 2026-06-12 00:00 |
04:03:48.33 |
+72:37:49.8 |
HIP 18916 |
12.18 |
| 2026-06-12 12:00 |
04:04:03.00 |
+72:38:12.3 |
HIP 18916 |
12.09 |
| 2026-06-13 00:00 |
04:04:17.64 |
+72:38:35.2 |
HIP 18916 |
12.10 |
| 2026-06-13 12:00 |
04:04:32.24 |
+72:38:58.5 |
HIP 18916 |
12.22 |
| 2026-06-14 00:00 |
04:04:46.79 |
+72:39:22.3 |
HIP 18916 |
12.43 |
| 2026-06-14 12:00 |
04:05:01.30 |
+72:39:46.5 |
HIP 18916 |
12.74 |
| 2026-06-15 00:00 |
04:05:15.77 |
+72:40:11.1 |
HIP 18916 |
13.13 |
| 2026-06-15 12:00 |
04:05:30.20 |
+72:40:36.1 |
HIP 18916 |
13.60 |
| 2026-06-16 00:00 |
04:05:44.58 |
+72:41:01.6 |
HIP 18916 |
14.14 |
| 2026-06-16 12:00 |
04:05:58.91 |
+72:41:27.4 |
HIP 18916 |
14.74 |
| 2026-06-17 00:00 |
04:06:13.20 |
+72:41:53.7 |
HIP 18916 |
15.40 |
| 2026-06-17 12:00 |
04:06:27.44 |
+72:42:20.3 |
HIP 18916 |
16.10 |
| 2026-06-18 00:00 |
04:06:41.63 |
+72:42:47.4 |
HIP 18916 |
16.85 |
| 2026-06-18 12:00 |
04:06:55.77 |
+72:43:14.9 |
HIP 18916 |
17.63 |
| 2026-06-19 00:00 |
04:07:09.86 |
+72:43:42.8 |
HIP 18916 |
18.44 |
| 2026-06-19 12:00 |
04:07:23.90 |
+72:44:11.1 |
HIP 18916 |
19.28 |
| 2026-06-20 00:00 |
04:07:37.89 |
+72:44:39.8 |
HIP 18916 |
20.15 |
| 2026-06-20 12:00 |
04:07:51.82 |
+72:45:08.8 |
HIP 18916 |
21.03 |
| 2026-06-21 00:00 |
04:08:05.70 |
+72:45:38.3 |
HIP 18916 |
21.93 |
| 2026-06-21 12:00 |
04:08:19.52 |
+72:46:08.2 |
HIP 18916 |
22.85 |
| 2026-06-22 00:00 |
04:08:33.29 |
+72:46:38.5 |
HIP 18916 |
23.78 |